$A$ simple pendulum of length $L$ has mass $m$ and it oscillates freely with amplitude $A$. At the extreme position,its potential energy is (where $g$ is the acceleration due to gravity):
- A$\frac{m g A^{2}}{2 L}$
- B$\frac{m g A^{2}}{L}$
- C$\frac{m g A}{L}$
- D$\frac{m g A}{2 L}$
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